Synergistic Integration of SrFeO₃ Nanoparticles With Exfoliated MXene (Ti₃C₂T_x/V₂CT_x) Nanosheets for High Performance...

The performance of supercapacitors is often limited by conventional electrode materials, which typically necessitate a compromise between energy density, power density, and cycling stability. While two-dimensional MXenes offer high conductivity and surface area, their practical application is hindered by restacking and oxidative degradation. This study introduces a novel heterostructured composite designed to overcome these limitations. For the first time, we fabricate a porous, exfoliated network by integrating zero-dimensional SrFeO₃ nanoparticles with Ti₃C₂T_x and V₂CT_x MXenes via a straightforward mechanical mixing process. In this architecture, the SrFeO₃ nanoparticles fulfill a dual role: they inhibit MXene restacking and contribute significant pseudocapacitance via Faradaic reactions. The synergistic coupling between the conductive MXene scaffolds and the redox-active nanoparticles yields exceptional electrochemical performance. The optimized Ti₃C₂T_x@SrFeO₃ and V₂C@SrFeO₃ electrodes achieve specific capacitances of 752 and 972 F g^{- 1}, respectively, at 1 A g^{- 1}, alongside excellent rate capability. Asymmetric supercapacitor devices assembled with these composites deliver high energy densities of up to 52.91 Wh kg^{- 1} and exhibit outstanding long-term stability, retaining over 93.9% of their initial capacitance after 5000 cycles. This work establishes the MXene/SrFeO₃ heterostructure as a promising platform for high performance energy storage.